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Old 06-21-2017, 08:46 AM   #1
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A raid question.

Hi, i am fairly new to linux and can mainly find the answers i need by googling but i have no idea with setting up raid.

Can anyone tell me what raid is installed just by looking at the output below?.

I thought i had setup raid 0, but i have the feeling the below is raid 1.


sda 2.7T
├─sda1 1M
├─sda2 ext4 2.7T /
└─sda3 swap 15.7G [SWAP]
sdb 2.7T
├─sdb1 linux_raid_member 8G rescue:0
├─sdb2 linux_raid_member 512M rescue:1
├─sdb3 linux_raid_member 1T rescue:2
├─sdb4 linux_raid_member 1.7T rescue:3
└─sdb5 1M
Old 06-21-2017, 09:45 AM   #2
Registered: Feb 2013
Distribution: Fedora 25, RHEL7, RHCI stack
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I'd be leaning towards 0, but just to check that all the information is available:

We can identify if there is a hardware RAID controller, by running "lspci -vv | grep -i raid" to find the controller.

The commands to work with each raid controller are different, unfortunately, so we would need to know the results.

But if this is a software raid, install 'mdadm' (using whatever distribution package installation method you have, it's in most of them). This utility will give you the tools to work with software RAID.
Old 06-21-2017, 10:19 AM   #3
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Looks like a failed attempt to set-up a software RAID on sdb, sda has no software raid, hardware raid and embedded RAID are unlikely to be presented directly and would require the specific tools/utilities of the storage controller to see.

As you can see in the below, the system does not see that there is in fact RAID and searching for raid doesn't even yield the storage controller which in this case is an LSI Storage Controller that is running in RAID 10. This is because this is a hardware RAID and not software.

fd0                               4K
sda                             1.8T
├─sda1             xfs            1G /boot
└─sda2             LVM2_member  1.8T
  ├─centos-root    xfs           50G /
  ├─centos-swap    swap          24G [SWAP]
  ├─centos-var     xfs           25G /var
  └─centos-Virtual xfs          1.7T /virtual
$ lspci -vv | grep -i raid
$ lspci -vv | grep -i lsi
01:00.0 SCSI storage controller: LSI Logic / Symbios Logic SAS1064ET PCI-Express Fusion-MPT SAS (rev 08)
        Subsystem: LSI Logic / Symbios Logic Device 3090
Old 06-21-2017, 11:38 AM   #4
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Thanks for the reply guys.

I should of mentioned this is a software raid, i also should of mentioned raid 0 or no raid is fine with me.
It was the rescue part that threw me.

Tbh all i want is access to sdb to use as storage, preferably on my desktop, i am using xfce, would this still be possible?


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